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1. def cleanword(word):

(用Python寫出程序，使程序可以通過下面的doctest)

"""

>>> cleanword('what?')

'what'

>>> cleanword('"now!"')

'now'

>>> cleanword('?+="word!,@$()"')

'word'

"""

2. def has_dashdash(s):

(用Python寫出程序，使程序可以通過下面的doctest)

"""

>>> has_dashdash('distance--but')

True

>>> has_dashdash('several')

False

>>> has_dashdash('critters')

False

>>> has_dashdash('spoke--fancy')

True

>>> has_dashdash('yo-yo')

False

"""

3. def extract_words(s):

(用Python寫出程序，使程序可以通過下面的doctest)

"""

>>> extract_words('Now is the time! "Now", is the time? Yes, now.')

['now', 'is', 'the', 'time', 'now', 'is', 'the', 'time', 'yes', 'now']

>>> extract_words('she tried to curtsey as she spoke--fancy')

['she', 'tried', 'to', 'curtsey', 'as', 'she', 'spoke', 'fancy']

"""

4. def wordcount(word, wordlist):

(用Python寫出程序，使程序可以通過下面的doctest)

"""

>>> wordcount('now', ['now', 'is', 'time', 'is', 'now', 'is', 'is'])

['now', 2]

>>> wordcount('is', ['now', 'is', 'time', 'is', 'now', 'is', 'the', 'is'])

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